Twin Pbt Operation - Icom IC-7000 Instruction Manual

5
FUNCTIONS FOR RECEIVE
T h e g e n e ra l P B T ( Pa s s b a n d Tu n i n g ) f u n c t i o n
electronically narrows the IF passband width by
shifting the IF frequency slightly outside of the IF filter
passband to reject interference. This transceiver uses
the DSP circuit for the PBT function. Moving both [PBT
] controls to the same position shifts the IF.
M-ch/RIT
Push
twin PBT function, if the M-ch-RIT is selected.
indicator (Green) lights.
width and shift frequency graphically. (The passband
settings window can be turned OFF in the display Set
mode. p. 125)
When M-1 is selected, hold down [F-3 FIL] for
1 second to enter the filter Set mode. Current
passband width and shift frequency is displayed in
the filter Set mode.
To set the [PBT
positions, hold down [PBT
second.
The limit of the variable range depends on the
passband width and mode. The limit of the variable
range is half of the passband width, and PBT is
adjustable in 100 (AM) or 25 Hz steps (other modes).
PBT OPERATION EXAMPLE
Both controls at
center position
IF center frequency
77
RIT] momentarily to select the
] controls to the center
/M-ch/RIT
CLR
(
/M-ch/RIT
Interference
[PBT
/M-ch/RIT
/
[PBT] (outer) control
Dot indicator appears
when PBT is activate
Passband
)] for 1
width
Shift
frequency
[PBT] controls should normally be set to the center
positions (PBT setting is cleared) when there is no
interference.
from the DSP unit and does not indicate an equipment
malfunction.
Cutting the lower
passband
Passband
Desired signal
(CLR)] switch/[PBT] (inner) control
[PBT/M-ch/RIT] indicator
[F-3]
[MENU/GRP]
Selected IF filter
Popup indicator appears
[PBT], noise may occur. This comes
Cutting both higher and
lower passbands
Passband
Interference Interference
Desired signal